White halo around exported flash gif animation

I am working on a Imac using Flash CS5. I can create a Flash animation with a transparent background

but there is a slight white halo around the images. How do I export a Flash animation as a gif with

absolutely no white halo at all. Is this possible? or wheneve you turn a vector to a gif there will

always be a slight white halo. I have brought the image into Photoshop and could painstakingly

use the eraser tool but there must be a way to mass assembly the process. I have tried Fireworks CS5

and Photoshop, whenever I open the Flash gif animation there is a slight white halo.

Look forward to the techy with the answer

thanks

Paul